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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '04b728c80d64f7ea564fa87fd00cdfa144bbfc5fda553b3b5193bc9d4eb8d197' 
  AND token = '2lBSO/y929KujaD7TgP4RfFEejuEw7HARyi/U1asUi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}